Rs232 Protocol; Command Structure - Planar QE Series User Manual

RS232 Protocol

RS232 Protocol

Command Structure

6
[OPCODE](MODIFIERS)[OPERATOR][OPERANDS][TERM]
• OPCODE is the command code (e.g. "GAIN"). This can be written either using the
named command code (see the "Command Code" column in the table) or the
numeric command code (see the "Numeric Command Code" column in the
table).
• MODIFIERS are modifier values [e.g. "(ZONE.1, ALL)"]. There are zero or more
modifiers for each command. The modifiers can be written either with their
named value or their numeric value (see "Examples" on page 7). See the
"Modifiers" column in the table.
• OPERATOR is the action to be performed. See the "Operators" column in the
table.
• '=' writes the setting value.
• '?' reads the setting value in name form (see "Examples" on page 7).
• '#' reads the setting value in numeric form (see "Examples" on page 7).
• '+' increments the setting value.
• '-' decrements the setting value.
• ':' indicates that the message is a response to one of the following operators:
=?#+-
• '!ERR' indicates that the message is a failure response. An error code will be
listed after the "ERR", with a space before it. Error codes are as follows:
• ERR 1: Invalid syntax
• ERR 2: [Reserved for future use]
• ERR 3: Command not recognized
• ERR 4: Invalid modifier
• ERR 5: Invalid operands
• ERR 6: Invalid operator
• '@ACK' indicates that the message is an acknowledgment (ACK) to a
command that has no operator.
• '^NAK' indicates that the message is a negative acknowledgment (NAK) to a
command. This indicates that the command was received but cannot be
processed at this time.
• [No operator] denotes an action. In this case, there's no operator and no
operand.
Planar QE Series RS232 User Manual